Vialat, P., Billecocq, A., Kohl, A., and Bouloy, M. (2000) The S segment of Rift Valley fever Phlebovirus (Bunyaviridae) carries determinants for attenuation and virulence in mice. Journal of Virology, 74 (3). pp. 1538-1543. ISSN 0022-538X (doi:10.1128/JVI.74.3.1538-1543.2000)
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Unlike all the other Rift Valley fever virus strains (Bunyaviridae, Phlebovirus) studied so far, clone 13, a naturally attenuated virus, does not form the filaments composed of the NSs nonstructural protein in the nuclei of infected cells (R. Muller, J. F. Saluzzo, N. Lopez, T. Drier, M. Turell, J. Smith, and M. Bouloy, Am. J. Trop. Med. Hyg. 53:405–411, 1995). This defect is correlated with a large in-frame deletion in the NSs coding region of the S segment of the tripartite genome. Here, we show that the truncated NSs protein of clone 13 is expressed and remains in the cytoplasm, where it is degraded rapidly by the proteasome. Through the analysis of reassortants between clone 13 and a virulent strain, we localized the marker(s) of attenuation in the S segment of this attenuated virus. This result raises questions regarding the role of NSs in pathogenesis and highlights, for the first time in theBunyaviridae family, a major role of the S segment in virulence and attenuation, possibly associated with a defect in the nonstructural protein.
|Glasgow Author(s):||Kohl, Dr Alain|
|Authors:||Vialat, P., Billecocq, A., Kohl, A., and Bouloy, M.|
|College/School:||College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation|
|Journal Name:||Journal of Virology|